钻柄

例句：

1. 1. The drill bit was too small for the job.
   钻头太小了，不适合这个工作。
2. 2. The engineer used a special drill bit to make the hole.
   工程师使用特殊的钻头来打孔。
3. 3. The drill bit broke off during the operation.
   操作过程中钻头断了。